[
    {
         "username" : "user123",
         "password" : "user123",
         "status_code":200,
         "errno":0,
         "errmsg":"成功"
    },
    {
         "username" : "user",
         "password" : "user123",
         "status_code":200,
         "errno":700,
         "errmsg":"不存在"
    },
    {
         "username" : "",
         "password" : "user123",
         "status_code":200,
         "errno":700,
         "errmsg":"不存在"
    },
    {
         "username" : "user123",
         "password" : "user",
         "status_code":200,
         "errno":700,
         "errmsg":"不对"
    },
    {
         "username" : "user123",
         "password" : "",
         "status_code":200,
         "errno":700,
         "errmsg":"不对"
    }
]